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Old 5th April 2014
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Focal length conundrum

I was going to try a quick comparison between my 14-150 Leica at 150mm an my 75-300 II just to see how they performed and I got a surprising result, see below. Images both shot at oblique angle through double glazing with lenses wide open.
Leica at 150mm


Oly at 150mm



Now can someone tell me why the Oly is actually showing the image at 32% bigger than the Leica when the exif on both says 150mm. Although I shot these hand held I was very careful to shoot from the same position for both shots.

So cropping both to approx. the same size image showed a pretty similar image performance. Overall I'd say the Leica shaded it but just in better contrast really, sharpness/resolution seemed pretty much a draw. Pretty good performance from the Oly I'd say. Here are some comparable crops.

Leica


Oly
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Re: Focal length conundrum

Here are a couple more closer crops. Again it shows the Oly lens working pretty well. Bokeh seems a bit worse though but maybe a bit of breeze could have affected the shots too.
Leica closer crop


Oly closer crop


Oh and no PP at all on any of theses shots just simple cropping.
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Old 5th April 2014
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Re: Focal length conundrum

Good set of comparison shots, strange difference in first two .

Maybe the EU regulations have changed 150mm which the Japanese would ignore, and your test has let the cat out of the bag (recycled or compostable)..............
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Re: Focal length conundrum

For image quality I can see quite a difference, with the Leica leading.
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Re: Focal length conundrum

unless you put the camera on a tripod and leave it there it's really easy to 'adjust' the working distance when changing lenses - the natural reference on close up shots is the front lens element rather than the sensor plane.

bokeh will be affected by both this and the AF plane; again this clearly isn't consistent between the two shots - take the lower left leaf in the crops as a reference to see just how much difference there is.

all that said I certainly wouldn't be surprised to see a latitude of 10% in the effective FL (from testing and reviews) let alone a system reported mid range indicated FL!
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Re: Focal length conundrum

Photo owl, you also need to consider focussing distance and type of focussing as they will have an affect on angle of view.
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Re: Focal length conundrum

I posted a thread about this some two years ago (can't find it now) comparing the Leica to another Oly lens - got the same findings as you but no-one could explain it!

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Re: Focal length conundrum

The focal length and angle of view of a lens is only (somewhat) accurate at infinity. It can change, sometimes quite dramatically, at closer focusing distances.
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Re: Focal length conundrum

Quote:
Originally Posted by David M View Post
Photo owl, you also need to consider focussing distance and type of focussing as they will have an affect on angle of view.
And distortion correction which crops the image too.
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Re: Focal length conundrum

Interesting discussion guys. What started off as a simple, oh i'll just try a quick and dirty comparison of lens quality as I was a bit bored, turned up that unusual size difference. I agree to do this properly I need to be more scientific with tripod etc. It's tempting but in view of what's been said already though it looks like it's a known phenomena so probably not worth the effort. David if you find that previous thread I'd be interested. As for the quality differences again I really should do a better experiment but on this evidence yes I agree with you Stephen the Leica does come out best. To be honest I'd have been disappointed if it hadn't but it was interesting to me to see (taking the dof differences in to account as well) just how well the Oly 75-300 did in comparison. Considering the new price difference between the lenses the Olympus is definitely delivering on value for money. I think the next comparison might be the Leica vs the Oly 12-50 at say 14 & 50mm.
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Re: Focal length conundrum

Just read your post again photo owl. As I didn't use a tripod I could have probably been a centimetre or two out in camera positioning I guess although I did line up the camera with a dirty mark on the window and lean on the window frame in the same way to minimise any movement. I probably should have rested the lens on the glass to be sure but didn't think of that. Interestingly having just compared the lenses the length of the Oly vs the Leica plus adaptor is pretty much the same, maybe a couple of mm longer for the Oly? but that's all. Definitely should have used the tripod but how sensitive would the image size be to this variation in working distance? would that account for the 32% I saw? Like you at 10% I wouldn't have been very surprised.
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Re: Focal length conundrum

It speaks volumes for the quality of the Leica that a 10.7x zoom outperforms a 4x one. The Leica also focuses to less than half the distance (0.5m v 1.5) making it good for close ups. I've been using mine as a walkabout lens on the E5 but perhaps I ought to switch it to the EM1.

Has anyone done a comparison between the Leica 14-150 and the Oly MFT 14-150 on an EM1?
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Re: Focal length conundrum

David that comparison is exactly what I was looking for. My suspicion is that I'd miss the quality of the Leica but love the more assured af and lighter weight for travel.
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Re: Focal length conundrum

Actually I have both but have been too idle to do a comparision. Perhaps I should find time to do one.
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Re: Focal length conundrum

That's a definite yes please from me
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